Toshiba and Toshiba Electronic Devices and Storage Corporation Assigned Eight Patents

Magnetic disk
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,403,323) developed by Kojima, Shuichi, Ota Tokyo, Japan, for “magnetic disk device and method of controlling the same.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”According to one embodiment, a magnetic disk device includes a disk, a head, and a controller configured to control the head based on a plurality of upper parameter groups each corresponding to a plurality of upper areas among a plurality of parameter groups each corresponding to a plurality of recording areas into which the disk is divided in a radial direction, the upper areas each corresponding to the recording areas, and a plurality of lower parameter groups each corresponding to a plurality of lower areas into which the upper areas are each divided in the radial direction, the lower parameter groups being different from the upper parameter groups among the parameter groups.”

The patent application was filed on September 10, 2018 (16/126,362).

Magnetic disk device and write capable of detecting data errors
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,395,690) developed by Okubo, Tomokazu, Kanagawa, Japan, for “magnetic disk device and write capable of detecting data errors and performing read-write verification thereof.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic disk device includes a disk, a head configured to write data on the disk based on a write current, and a controller configured to determine whether a write error occurs when data is written on the disk, based on a change in a heating value of the head, and upon determining that the write error occurs, read the data written on the disk.”

The patent application was filed on February 28, 2018 (15/908,786).

Disk device
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,373,651) developed by Sato, Yuki, Fujisawa Kanagawa, Japan, for a “disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A disk device includes a top cover and a disk medium with a recording surface. The top cover includes a center horizontal portion having a surface which extends from a center point of the disk medium along the recording surface to an outer peripheral portion, a curved portion having a surface which extends from the outer peripheral portion of the center horizontal portion in a direction away from the recording surface, and an outer horizontal portion having a surface which extends from the curved portion in a direction away from the center point and along the recording surface. The recording surface includes a first zone in which data is set to be written, and a second zone in which data is set not to be written, the second zone being disposed adjacent to the first zone on an outer edge side of the disk medium from the first zone.”

The patent application was filed on February 28, 2018 (15/908,796).

Magnetic disk and command reordering
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,372,375) developed by Iwashiro, Masafumi, Yokohama Kanagawa, Japan, for “magnetic disk device and command reordering method thereof.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic disk device includes a magnetic disk, a magnetic head, a voice coil motor which drives movement of the magnetic head relative to the magnetic disk, a drive circuit which drives the voice coil motor, a memory in which a seek time for a seek operation is stored in association with a seek distance of the magnetic head, and a controller. The controller changes the seek time stored in the memory in association with the seek distance based on a temperature and a power supply voltage of the drive circuit.”

The patent application was filed on February 28, 2017 (15/445,846).

Magnetic disk and method of writing RRO correction data
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,366,717) developed by Kudo, Fumiya, Kamakura Kanagawa, Japan, for “magnetic disk device and method of writing RRO correction data.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”According to one embodiment a magnetic disk device, includes a disk which includes a plurality of servo sectors radially extending in a radial direction and being discretely disposed with a gap in a circumferential direction, a head which writes data to the disk and reads data from the disk, and a controller which writes a plurality of pieces of correction data with respect to a repeatable run-out of the disk to a plurality of first sectors disposed between the servo sectors in a first region, and writes the pieces of correction data to a plurality of second sectors disposed between the servo sectors in a second region different from the first region.”

The patent application was filed on September 12, 2018 (16/128,977).

Magnetic recording
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,360,931) developed by Ohtake, Masaya, Fujisawa Kanagawa, Japan, Takeo, Akihiko, Kokubunji, Tokyo, Japan, Koizumi, Gaku, Yokohama Kanagawa, Japan, and Tomoda, Yusuke, Kawasaki Kanagawa, Japan, Japan, for a “magnetic recording apparatus.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic recording apparatus includes a disk-shaped recording medium with a magnetic recording layer, and a recording head that magnetically writes data onto the magnetic recording layer and includes a main magnetic pole, a write shield facing the main magnetic pole and positioned with a writing gap disposed between the main magnetic pole and the write shield, and a magnetic flux control layer disposed inside the write gap between the main magnetic pole and the writing shield. The magnetic flux control layer includes a first layer including a first metal and contacting one of the main magnetic pole and the writing shield, a second control layer, and a third layer including a second metal and contacting the other one of the main magnetic pole and the writing shield. The second control layer includes a magnetic metal and contacts the first layer and the third layer.”

The patent application was filed on August 27, 2018 (16/113,094).

Disk and method of manufacturing
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,360,930) developed by Asakura, Makoto, Bunkyo Tokyo, Japan, Tagami, Naoki, Yokohama Kanagawa, Japan, and Hara, Takeyori, Kawasaki Kanagawa, Japan, for “disk device and method of manufacturing disk device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”According to one embodiment, in a disk device, the head includes a first read element and a second read element. The disk medium is partitioned into a plurality of zones. The plurality of zones include a first zone and a second zone. The first zone includes a plurality of tracks on each of which a servo area and a data area are placed, a servo burst region in the servo area from which to detect the amount of off-track of the head from the center of a track, having a first bit length. The second zone includes a plurality of tracks on each of which a servo area and a data area are placed, a servo burst region in the servo area from which to detect the amount of off-track of the head from the center of a track, having a second bit length shorter than the first bit length.”

The patent application was filed on August 29, 2018 (16/116,304).

Disk device with first and second cover sealing structure
Kabushiki Kaisha Toshiba, Tokyo, Japan, and Toshiba Electronic Devices and Storage Corporation, Tokyo, Japan, has been assigned a patent (10,360,929) developed by Suzuki, Yasuo, Fujisawa Kanagawa, Japan, for “disk device with first and second cover sealing structure.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”According to one embodiment, a disk device includes a rotatable recording medium, a head, and a housing which includes a first enclosed space accommodating the recording medium and the head, and a second enclosed space defined between the first enclosed space and outside air. Low-density gas is sealed in each of the first enclosed space and the second enclosed space, and a pressure of the first enclosed space is different from that of the second enclosed space.”

The patent application was filed on February 28, 2018 (15/907,863).